40 lines
987 B
Python
40 lines
987 B
Python
#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""
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Topic: 字符串搜索和替换
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Desc :
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"""
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import re
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from calendar import month_abbr
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def change_date(m):
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mon_name = month_abbr[int(m.group(1))]
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return '{} {} {}'.format(m.group(2), mon_name, m.group(3))
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def search_replace():
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text = 'yeah, but no, but yeah, but no, but yeah'
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print(text.replace('yeah', 'yep'))
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# 复杂的模式，使用sub()
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text = 'Today is 11/27/2012. PyCon starts 3/13/2013.'
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print(re.sub(r'(\d+)/(\d+)/(\d+)', r'\3-\1-\2', text))
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print(re.sub(r'(?P<month>\d+)/(?P<day>\d+)/(?P<year>\d+)', r'\g<year>-\g<month>-\g<day>', text))
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# 先编译
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datepat = re.compile(r'(\d+)/(\d+)/(\d+)')
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print(datepat.sub(r'\3-\1-\2', text))
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# 更复杂的替换，使用回调函数
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print(datepat.sub(change_date, text))
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# 同时返回替换次数
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newtext, n = datepat.subn(r'\3-\1-\2', text)
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print(newtext, n)
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if __name__ == '__main__':
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search_replace()
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